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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment Depreciation is calculated based on the cost, net of the estimated residual value, over the estimated useful life of the assets on the following bases and rates:
AssetsBasisRate
Heavy equipmentUnits of production
3,000 - 120,000 hours
Major component parts in useUnits of production
2,500 - 70,000 hours
Other equipmentStraight-line
5 - 10 years
Licensed motor vehiclesStraight-line
5 - 10 years
Office and computer equipmentStraight-line
4 - 10 years
Furnishings, fixtures and facilitiesStraight-line
10 - 30 years
BuildingsStraight-line
10 - 50 years
Leasehold improvementsStraight-lineOver shorter of estimated useful life and lease term
LandNo depreciationNo depreciation
December 31, 2022CostAccumulated
Depreciation		Net Book Value
Owned assets
Heavy equipment$368,318 $123,695 $244,623 
Major component parts in use388,169 163,124 225,045 
Other equipment40,752 30,769 9,983 
Licensed motor vehicles12,109 6,800 5,309 
Office and computer equipment7,510 5,669 1,841 
Buildings29,725 4,489 25,236 
Capital inventory and capital work in progress 46,050 — 46,050 
Land10,472 — 10,472 
903,105 334,546 568,559 
Assets under finance lease
Heavy equipment75,750 28,265 47,485 
Major component parts in use40,406 22,264 18,142 
Other equipment4,238 1,814 2,424 
Licensed motor vehicles9,669 469 9,200 
130,063 52,812 77,251 
Total property, plant and equipment$1,033,168 $387,358 $645,810 
December 31, 2021CostAccumulated
Depreciation		Net Book Value
Owned assets
Heavy equipment$351,023 $105,686 $245,337 
Major component parts in use332,042 131,157 200,885 
Other equipment44,548 30,633 13,915 
Licensed motor vehicles15,113 10,838 4,275 
Office and computer equipment6,845 4,891 1,954 
Buildings29,386 3,748 25,638 
Capital inventory and capital work in progress38,350 — 38,350 
Land10,472 — 10,472 
827,779 286,953 540,826 
Assets under finance lease
Heavy equipment92,690 28,504 64,186 
Major component parts in use52,679 21,996 30,683 
Other equipment4,633 1,281 3,352 
Licensed motor vehicles2,674 771 1,903 
152,676 52,552 100,124 
Total property, plant and equipment$980,455 $339,505 $640,950